SMDJ6.5 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMDJ6.5 is a unidirectional transient voltage suppressor diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 6.5V reverse standoff voltage, 11.76V maximum clamping voltage, and 267.9A peak pulse current capability in a DO-214AB (SMC) package. The SMDJ6.5 is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	6.5	V
Voltage - Breakdown (Min)	6.84	V
Voltage - Clamping (Max) @ Ipp	11.76	V
Current - Peak Pulse (10/1000µs)	267.9	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-65 to 150	°C
Package / Case	DO-214AB, SMC	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SMDJ6.5 is determined by the following critical parameters:

Voltage Rating: Reverse standoff voltage of 6.5V and breakdown voltage minimum of 6.84V
Clamping Voltage: Maximum clamping voltage at peak pulse current (Ipp)
Peak Pulse Current: 267.9A capability at 10/1000µs pulse width
Power Dissipation: Peak pulse power rating of 3000W
Package Type: DO-214AB (SMC) surface-mount configuration
Device Type: Unidirectional Zener TVS diode
Compliance: ROHS3 compliance and operating temperature range

Substitute parts are grouped into two categories based on electrical performance:

Category A - Full Electrical Equivalents (267.9A peak pulse current, 3000W power rating):

SMDJ6.5A (Alpha & Omega Semiconductor Inc.)
SMLJ6.5A (Bourns Inc.)
SMLJ6.5A-TP (Micro Commercial Co)
SMLJ6.5AE3/TR13 (Microchip Technology)

Category B - Reduced Current Equivalents (133.9A to 140A peak pulse current, 1500W power rating):

SMCJ6.5A (Taiwan Semiconductor Corporation)
SMCJ6.5AE3/TR13 (Microchip Technology)
TV15C6V5J-G (Comchip Technology)
TV15C6V5J-HF (Comchip Technology)

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temperature (°C)	Package	Product Status
SMDJ6.5	Littelfuse	6.5	11.76	267.9	3000	-65 to 150	DO-214AB, SMC	Obsolete
SMDJ6.5A	Alpha & Omega Semiconductor Inc.	6.5	11.2	267.9	3000	-55 to 150	DO-214AB, SMC	Active
SMCJ6.5A	Taiwan Semiconductor Corporation	6.5	11.2	140	1500	-55 to 150	DO-214AB, SMC	Active
SMCJ6.5AE3/TR13	Microchip Technology	6.5	11.2	133.9	1500	-65 to 150	DO-214AB, SMC	Active
SMLJ6.5A	Bourns Inc.	6.5	11.2	267.9	3000	-55 to 150	DO-214AB, SMC	Active
SMLJ6.5A-TP	Micro Commercial Co	6.5	11.2	267.9	3000	-55 to 175	DO-214AB, SMC	Active
SMLJ6.5AE3/TR13	Microchip Technology	6.5	11.2	267.9	300	-55 to 150	DO-214AB, SMC	Active
TV15C6V5J-G	Comchip Technology	6.5	11.2	133.93	1500	-55 to 150	DO-214AB, SMC	Active
TV15C6V5J-HF	Comchip Technology	6.5	11.2	133.93	1500	-55 to 150	DO-214AB, SMC	Active

Engineering Selection Recommendations

For Direct Replacement (Full Electrical Equivalence):

Select SMDJ6.5A, SMLJ6.5A, SMLJ6.5A-TP, or SMLJ6.5AE3/TR13 when the application requires the full 267.9A peak pulse current and 3000W power dissipation capability of the original SMDJ6.5. All four parts maintain the 6.5V reverse standoff voltage and 11.2V clamping voltage specification. All are ROHS3 compliant and actively manufactured.

SMLJ6.5A-TP offers the widest operating temperature range (-55 to 175°C), providing additional thermal margin for high-temperature applications.

SMCJ6.5AE3/TR13 maintains the original -65°C lower temperature limit but features reduced power dissipation (300W vs. 3000W), making it unsuitable for high-energy transient protection.

For Current-Limited Applications:

Select SMCJ6.5A, SMCJ6.5AE3/TR13, TV15C6V5J-G, or TV15C6V5J-HF when the application can tolerate reduced peak pulse current (133.9 to 140A) and lower power dissipation (1500W). These parts maintain voltage compatibility and are suitable for lower-energy transient suppression scenarios.

SMCJ6.5AE3/TR13 and TV15C6V5J-G/HF are preferred for their active product status and full ROHS3 compliance.

Compliance Considerations:

All substitute parts listed are ROHS3 compliant. SMLJ6.5A carries REACH Affected status; all other substitutes are REACH Unaffected or REACH Compliant.

Frequently Asked Questions (FAQ)

Q: Can SMCJ6.5A directly replace SMDJ6.5 in all applications?

A: SMCJ6.5A is electrically compatible for voltage protection but features reduced peak pulse current (140A vs. 267.9A) and power dissipation (1500W vs. 3000W). Use SMCJ6.5A only in applications where transient energy levels do not exceed 1500W. For high-energy transient protection, select SMDJ6.5A, SMLJ6.5A, or SMLJ6.5A-TP.

Q: What is the difference between SMLJ6.5A and SMLJ6.5AE3/TR13?

A: Both parts share identical voltage and current ratings (6.5V standoff, 267.9A peak pulse). SMLJ6.5AE3/TR13 is supplied in Tape & Reel packaging and features significantly reduced power dissipation (300W vs. 3000W). SMLJ6.5A is the preferred choice for standard 3000W applications.

Q: Are all substitute parts available in DO-214AB (SMC) package?

A: Yes. All listed substitute parts are manufactured in DO-214AB (SMC) surface-mount package, ensuring mechanical and footprint compatibility with the original SMDJ6.5.

Q: Which substitute offers the best temperature performance?

A: SMLJ6.5A-TP provides the widest operating temperature range (-55 to 175°C), offering superior thermal margin compared to the original SMDJ6.5 (-65 to 150°C) at the upper temperature limit.

Q: Is SMDJ6.5A the recommended first choice for replacement?

A: SMDJ6.5A is a direct electrical equivalent manufactured by Alpha & Omega Semiconductor Inc. with full 267.9A peak pulse current and 3000W power rating. It is an appropriate first-choice replacement for the obsolete SMDJ6.5 in applications requiring full electrical equivalence.

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